Announcing Buildkite Agent v3.0

Buildkite has released version 3 of its build agent software with new features such as plugin support in build steps, a new annotate command to add content at the top of builds, and environment variable substitution for pipeline uploads. Additionally, there have been performance and stability improvements including large artifact support via multi-part upload, porting the job runner from Bash to Golang for better Windows support, and a new pre-exit hook. The upgrade guide is available at https://buildkite.com/docs/agent/v3/upgrading.